Improvement in mouth-pieces for steam-boiler furnaces



C. STEWART.

Mouth-Piace for Steam-Bpiler Furnaces, `144,002, 4 Patented Oct.28,1873.

LTNTTED STATESy PATENT @Prion CHARLES STEWART, OF WORCESTER,MASSACHUSETTS, ASSIGNOR OF ONE- HALF HIS RIGHT TO, WILLIAM ALLEN, OFSAME PLACE.

IMPROVEMENT IN MOUTH-PIECES FOR STEAM-BOILER FURNACES.

Specification forming part of Letters Patent No. 144,002, dated October28, 1873; application filed October 1, 1873.

To all whom it may concern:

of the city and county of Vorcester and State of Massachusetts, haveinvented a certain new and useful Mouth-Piece for Steam-Boiler Furnaces5 and I do hereby declare that the following is a full, clear, and exactdescription of the saine, reference being had to the accompanyingdrawings, which represent such portions ofa boiler-furnace as arenecessary to illustrate my invention.

Figure l represents a front elevation view; Fig. 2, a vertical sectionat line ai; Fig. 3, a transverse vertical section, showing an interiorview of the furnace-front; and Fig. 4, a front view of the mouth-piece,when made in a slightly-modified form.

rlhe object of my invention is to provide a mouth-piece for steam-boilerfurnaces which shall be more durable, and which will protect and supportthe brick-work of the furnacefront in a better and more thorough manner,than those in ordinary use-one which will facilitate the operation ofstoking or iirin g, and that can be readily and cheaply renewed whenburned out. To this end my invention consists in apeculiarly-constructed mouth-piece, combined and arranged substantiallyas hereinafter set forth. 4 A

In the drawings, the part marked A represents the boiler. B indicatesthe brick-Work or furnace-walls; C, the opening into the furnace, D, themetal front-plate, and E E1 the improved mouth-piece, E indicating thelower and E1 the upper sections thereof. The two sections of themouth-piece are in the present instance made of cast metal, in the formshown,

section E comprising that portion at the bottom and sides of the openingC, and section El consisting of an elliptically-arehed plate fitted tothe lower part with flanges and grooves at the sides of the opening, asindicated at a a. The top and sides of the mouthpiece are splayed inwardto give a greater opening at the inner end of the mouth, and thusfacilitate the operation of stoking or firing. Ear-pieces f are formedupon the front part of the sections E El, and the mouth-piece isfastened to the front plate D by screws orbolts, I, which pass throughsaid ears and plate, so as to permit of their being loosened from theexterior.

The mouth-piece may, if desired, be made with more than two sections, asshown in Fig. 4, wherein the sides E2 are sections or separate piecesfrom the top E1 and bottom E. This construction-is desirable in furnaceswhere the sides E2 are liable to kbe rapidly burned out; butgenerally'two sections, or the form shown in Figs. l, 2, and 3, is to bepreferred.

Among the advantages incident to my invention may be mentioned thefollowing: The mouth-piece in itself is much more durable than the platewhich is ordinarily used, and ,when burned out can be renewed with muchless trouble and expense. Being made in sections, and secured to thefront D by bolts, I, accessible at thevoutside, the top E1, which is theportion chiefly acted upon by the heat, can be renewed withoutdisturbing the lower portion 5 or, when made in the form shown in Fig.4, either side may be removed without disturbing the other parts. As itrequires the removal and'relaying of but a small portion of thebrick-work, as compared with the amount which has to be removed infurnaces of ordinary construction when renewing the plates, and as itdoes not require to be renewed nearly as often, while the weight ofmetal used in its construction is much less, it will readily be observedthat the use of my improved mouthpiece tends to reduce the cost ofmaintaining the furnace in a considerable degree.

This mouth-piece also supports the brickwork of the furnace in the mostthorough manner, as the form of the top is such that it does not expandand warp downward by the action ofthe heat, and thus loosen the bricksbeneath the front end of the boiler. It also protects the bricks at thesides of the opening and prevents their being broken away, while itsopening is of such shape as to allow free access to all parts-of theinterior of the furnace, so that the operations of firing can beconveniently performed.v4

The flanges and grooves, while they lock the parts together similar to asolid piece, permit of either section being removed by sliding it backin a direction parallel to the flanges.

Having described my improved month-piece for boiler-furnaces,wh2tt Iclaim therein as new :md of my invention, and desire to secure byLetters Patent, is

l. The month-piece E E1 for steam-boiler furnaces, the parts thereofbeing constructed and combined with the furnace-front D, substentiallyas herein shown and described.

2. The combination, With the front D in a steam-boiler furnace, of asectional mouthpiece, comprising two or more sections, the

edges of which are matched to each other with flanges and grooves,whereby, While the parts are held firmly to each other, either sectioncan be removed Without disturbing the other section, substantially esand for the purpose set forth.

CHARLES STEWART.

Witnesses GHAs. H. BURLEIGH, Gno. J MoWRY.

